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Message-Id: <5D5E2513-D8A5-4EA4-8579-4BBD0CEC428D@goldmark.org>
Date: Tue, 31 Jul 2012 23:56:14 -0500
From: Jeffrey Goldberg <jeffrey@...dmark.org>
To: john-users@...ts.openwall.com
Subject: Re: 1Password blog post about Dhiru's new/forthcoming 1Password module
On 2012-07-31, at 12:48 PM, "Brad Tilley" <brad@...ystems.com> wrote:
>> On a related note, has anyone developed a rule set for going after
>> diceware generated passwords?
>
> I use word machine with the diceware word list or the most common
> wikipedia English word list
Thanks, Brad! That makes sense.
> wm --low --words words.txt | \
> wm --append 1 --chars=" " --words stdin | \
> wm --awords words.txt --words stdin | \
> wm --append 1 --chars=" " --words stdin | \
> wm --awords words.txt --words stdin | \
> wm --append 1 --chars=" " --words stdin | \
> wm --awords words.txt --words stdin | \
> john --format=nt --pipe hashes.txt
Thanks!
> The diceware word list is large (more than seven thousand words if I
> recall correctly).
It's 6^5 (each word is determined by five sequential roles of a die); so it is 7776 words long.
> So a four word diceware password would be difficult to
> crack
Yep. Each word adds 12.9 bits of entropy.
> It has been my experience that most corporate password complexity policies
> (outside of intelligent ones that use passwdqc) force the use of upper,
> lower, numbers, and special digits
> The other issue I've encountered with diceware is password length
> limitations.
The situation I am thinking of is not for an authentication password, but as an encryption password or master password for a password management system. So those sorts of problems don't apply. I've been advocating the use of diceware for this and wanted to benchmark c/s.
I'm very new to actually using JtR, so responses like yours about word machine are extremely helpful.
Cheers,
-j
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